Diffraction



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              Holography is the technique to produce Holograms. In this technique the light is allowed to scattered from the object which is to be recorded and subsequently reconstructed so that it appears as if the object is in same position relative to recording medium. The image changes as the position and orientation of the viewing system changes in exactly in the same way as if the object were still present.

              Holography is "lensless photography" in which an image is captured not as an image focused on film, but as an interference pattern at the film. Typically, coherent light from a laser is reflected from an object and combined at the film with light from a reference beam. This recorded interference pattern actually contains much more information that a focused image, and enables the viewer to view a true three-dimensional image which exhibits parallax. That is, the image will change its appearance if you look at it from a different angle, just as if you were looking at a real 3D object. In the case of a transmission hologram, you look through the film and see the three dimensional image suspended in midair at a point which corresponds to the position of the real object which was photographed.